Well, if the piece came out of the housing and the part is stuck in the impeller ... you could just buy a new impeller as the cheapest option.
You could also likely save a little electricity by getting a smaller (1HP) impeller so the motor does not have to work as hard ... it does not appear like you have anything that requires the higher flow rates of the 1.5HP motor (no spa, waterfall, etc).
If $ is an issue like you previously state, that would be the cheapest path forward.
Does the motor turn easily and quietly? I see a little rust on the bottom of the motor so wondering if the bearing might be going bad. In the future, you could replace the motor with a 1HP 2-speed and save even more money on electricity by running on low speed.
You could also likely save a little electricity by getting a smaller (1HP) impeller so the motor does not have to work as hard ... it does not appear like you have anything that requires the higher flow rates of the 1.5HP motor (no spa, waterfall, etc).
If $ is an issue like you previously state, that would be the cheapest path forward.
Does the motor turn easily and quietly? I see a little rust on the bottom of the motor so wondering if the bearing might be going bad. In the future, you could replace the motor with a 1HP 2-speed and save even more money on electricity by running on low speed.